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http://dx.doi.org/10.9719/EEG.2022.55.6.583

Modeling of Geochemical Variations and Weathering Depth on the Surface of Pelitic Rocks in Periodical Submerging Zone: Bangudae Petroglyphs  

Chan Hee Lee (Department of Cultural Heritage Conservation Sciences, Kongju National University)
Yu Gun Chun (Department of International Cooperation, Korea Cultural Heritage Foundation)
Publication Information
Economic and Environmental Geology / v.55, no.6, 2022 , pp. 583-596 More about this Journal
Abstract
The rock surface of Bangudae petroglyphs is mainly dark brown hornfelsified shales by contact metamorphism. The surface form a weathered layer of a invariable depth, and there is a difference with mineral and chemical composition between weathered and non-weathered layers. Surface of the petroglyphs has been discolored to light brown over the face due to biological and chemical weathering. As the measuring chromaticity based on the non-weathered layer, the whiteness and yellowness increased in the weathered layer, and the color difference (ΔE) was 5.54 to 36.89 (mean 17.26). In the weathered layer of the petroglyph surface, the CaO content was reduced by about 90% compared to the non-weathered layer, and Sr also showed the same trend. In particular, the mean porosity of the non-weathered layer was 0.4%, but it was estimated as 25.0% in the weathered layer. This is interpreted as the fact that calcite reacts with water, and forms a weathered layer from the surface as it is eluted. Based on the weathering depth modeling of the petroglyphs using the penetration characteristics of X-rays, the weathering depth of rock faces was found to be 1 to 2mm. However, the area classified as 2mm or more estimated to be a maximum of 3 to 4mm, considering the weathering depth around the petroglyphs surface.
Keywords
petroglyphs; chemical weathering; chromaticity and porosity; CaO content; weathering depth modeling;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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